[IPython-dev] Debugging when communication of notebook with kernel lost?

[Anton Suchaneck]

Hello,

I've now repeatedly had this issue in different systems, where the IPython
just stopped executing any further cells. Maybe I can try to tell what I
observed (since it's hard to reproduce not all points are clear to me):
* cells that usually run in milliseconds, just show [*] and nothing happens
anymore.
* there is no message on the IPython console or the Javascript console
* it happens on Firefox, Chrome, Windows, Linux (not just my own system). I
suppose all had an antivirus - one had only McAfee
* on the IPython console window the notebook continues to save itself
(while no cell is executed)
* I believe once it continued after a long pause, but I'm not sure
* kernel restarting from the menu usually does not fix it
* the only thing that seems to work is going to the IPython home screen,
shutdown the notebook and restart
* sometimes I see "KeyboardInterrupt" in the console at eventloops.py: line
30, process_stream_events()
* I have a vague impression it happens more often when I do plotting, but
that's just a guess

What would you suggest to find out what's going on?

Regards,
Anton


2015-06-27 15:31 GMT+02:00 Matthias Bussonnier <bussonniermatthias at gmail.com
>:

> Hi Anton,
>
>
> > On Jun 27, 2015, at 14:36, Anton Suchaneck <a.suchaneck at gmail.com>
> wrote:
> >
> > Hi!
> >
> > I occasionally have the issue that no more commands are being executed
> in the IPython notebook. The interface responds, but just leaves [*] cells
> without progressing or interrupting on request. Sometimes this even happens
> right after starting. I cannot find an error message. Often restarting the
> kernel works, but sometimes even that doesn't work right away.
>
>
> This look really like
> 1) the kernel is actually doing computation
> 2) the packets get intercepted/dropped in between fronted/server.
>
> I doubt this is 1, so it is most likely 2,
>
> unfortunately if it is 2, there will probably not be errors, are we are
> just waiting for things that will never come back.
>
> > How can I inspect what's going on (and maybe report that)?
>
> I would suggest starting the notebook with --debug, to get more verbose
> messages if any,
> and can you look at the Javascript console to see if there is anything ?
>
> > I work on a local Windows 7 computer with company firewall. Someone
> suggested it's due to Windows.
>
> Do you have sophos antivirus ?
>
> Cheers,
> --
> M
> _______________________________________________
> IPython-dev mailing list
> IPython-dev at scipy.org
> http://mail.scipy.org/mailman/listinfo/ipython-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/ipython-dev/attachments/20150814/8015691e/attachment.html>